CN100458307C

CN100458307C - Freezing apparatus

Info

Publication number: CN100458307C
Application number: CNB2005800284750A
Authority: CN
Inventors: 森胁道雄; 钵谷克己; 井之口优芽; 佐佐木能成
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2004-08-31
Filing date: 2005-08-30
Publication date: 2009-02-04
Anticipated expiration: 2025-08-30
Also published as: WO2006025397A1; EP1808653A1; JP2006071137A; CN101006310A; AU2005278483A1; JP4375171B2; KR100837498B1; AU2005278483B2; US20080098758A1; KR20070046922A

Abstract

A refrigerant regulation tank (14) is provided in a refrigerant circuit (11) of an air conditioner (10). The refrigerant regulation tank (14) is disposed directly behind an expander (16). The refrigerant circuit (11) is provided with liquid injection piping (31) and gas injection piping (33). When a liquid side adjustment valve (32) is opened, a liquid refrigerant in the refrigerant regulation tank (14) is supplied through the liquid injection piping (31) to the suction side of a compressor (15). On the other hand, when a gas side control valve (34) is opened, a gas refrigerant in the refrigerant regulation tank (14) is supplied through the gas injection piping (33) to the suction side of the compressor (15). Condition of a refrigerant sucked into the compressor (15) is varied by adjusting the opening of the liquid side control valve (32) or the gas side control valve (34), which balances the amount of a refrigerant passing through the compressor (15) and the amount of a refrigerant passing through the expander (16).

Description

Refrigerating plant

Technical field

The present invention relates to a kind of refrigerating plant that comprises the refrigerant loop that is connected with the decompressor that is used to reclaim power.

Background technology

Up to the present,, comprise being connected with power recovery with the refrigerant loop of decompressor, allow cold-producing medium in this refrigerant loop, circulate and to carry out the refrigerating plant of freeze cycle known as disclosed in patent documentation 1, the patent documentation 2.Freeze in the device this, decompressor and compressor mechanically couple together by axle etc.So the power that obtains that expands in this decompressor by cold-producing medium is used for the drive compression machine, reduce input to the motor of drive compression machine, seek the raising of the coefficient of performance (COP:Coefficient of Perfromance).

In described refrigerating plant, compressor and decompressor couple together in the refrigerant loop that is the loop circuit.Therefore, the mass flow of the cold-producing medium by compressor must be always equates with the mass flow of cold-producing medium by decompressor.But the state (temperature, pressure, density etc.) of the cold-producing medium of the cold-producing medium that compressor sucks, inflow decompressor can have change owing to the operating condition of refrigerating plant.So, under the such situation of the rotary speed that for example can not set compressor and decompressor respectively, refrigerant amount by compressor and the refrigerant amount by decompressor will disequilibriums, and can not carry out freeze cycle under suitable condition, and this is a kind of worry.

Here, in patent documentation 1 disclosed refrigerating plant, be provided with bypass path with the decompressor bypass.So, under the very few relatively operating condition of the refrigerant amount by decompressor, allow cold-producing medium also flow into bypass path, thus with compressor pass through refrigerant amount and decompressor pass through the refrigerant amount balance.And, in patent documentation 2 disclosed refrigerating plants, in series be provided with expansion valve with decompressor.So, under the too much relatively operating condition of the refrigerant amount by decompressor, allow cold-producing medium in decompressor and expansion valve, all expand, make thus compressor pass through refrigerant amount and decompressor pass through the refrigerant amount balance.

Patent documentation 1: the spy opens 2001-116371 communique patent documentation 2: the spy opens the 2003-121018 communique

The problem that the summary of the invention invention will solve

As mentioned above, in possessing the existing refrigerating plant of decompressor, by the state that changes the cold-producing medium by decompressor make compressor pass through refrigerant amount and decompressor pass through the refrigerant amount balance.So, in decompressor, can reducing from the power of refrigerant-recovery, COP can not improve fully, and this is a worry.That is to say that if the part of cold-producing medium, is then passed through the just minimizing of refrigerant amount of decompressor to the decompressor bypass, the power that can obtain just reduces in decompressor.And if allow cold-producing medium all expand in decompressor and expansion valve, then the pressure differential at place, decompressor gateway just reduces.Also be that the power that can obtain in decompressor reduces in this case.

The present invention researchs and develops out for addressing the above problem just.Its purpose is: in comprising the refrigerating plant of decompressor, no matter operating condition how, all make compressor pass through refrigerant amount and decompressor pass through the refrigerant amount balance, the amount of power that can reclaim in decompressor does not but reduce.In order to the technical scheme of dealing with problems

The invention of first aspect to be to comprise the refrigerant loop 11 that is connected with in order to the decompressor 16 that reclaims power, allows cold-producing medium circulate in this refrigerant loop 11 and the refrigerating plant that carries out freeze cycle is an object.This refrigerating plant comprises: cold-producing medium adjusting tank 14, be set in this refrigerant loop 11 from decompressor 16 to compressor 15 cold-producing medium circulation path for the amount of the cold-producing medium that is adjusted in the described refrigerant loop 11 circulation midway, liquid sprays path 31, in order to the liquid refrigerant in the described cold-producing medium adjusting tank 14 is supplied with the suction side of described compressor 15, and fluid flow governor motion 32, in order to regulate the refrigerant flow in the described liquid injection path 31.

The invention of second aspect is such, and in the invention of described first aspect, cold-producing medium adjusting tank 14 is set at from decompressor 16 to compressor 15 the cold-producing medium circulation path than evaporimeter down downstream also.

The invention of the third aspect is such, and in the invention of described first aspect, cold-producing medium adjusting tank 14 is set at from decompressor 16 to compressor 15 the cold-producing medium circulation path than evaporimeter up upstream side also.

The invention of fourth aspect is such, in the invention of the described third aspect, comprise: spray path 33 and in order to regulate the gas flow governor motion 34 that described gas sprays the refrigerant flow in the path 33 in order to the gas of the suction side that the gas refrigerants in the cold-producing medium adjusting tank 14 fed to compressor 15.

The invention of the 5th aspect is such, in the invention of described first aspect, second aspect, the third aspect or fourth aspect, allow cold-producing medium in refrigerant loop 11, circulate and the high pressure of the freeze cycle of carrying out is set to the value also higher than the critical pressure of this cold-producing medium.

The invention of the 6th aspect is such, in the invention of described first aspect, second aspect or the third aspect, allows cold-producing medium circulate in refrigerant loop 11 and the high pressure of the freeze cycle of carrying out is set to the value also higher than the critical pressure of this cold-producing medium; This refrigerating plant comprises controlling

organization

90, and 90 pairs of fluid flow governor motions 32 of this controlling organization are controlled, and making becomes the control desired value of regulation from the temperature of the cold-producing medium of compressor 15 ejections.

The invention of the 7th aspect is such, in the invention of described fourth aspect, allows cold-producing medium circulate in refrigerant loop 11 and the high pressure of the freeze cycle of carrying out is set to the value also higher than the critical pressure of this cold-producing medium; This refrigerating plant comprises controlling

organization

90, and 90 pairs of fluid flow governor motions 32 of this controlling organization and gas flow control device 34 are controlled, and making becomes the control desired value of regulation from the temperature of the cold-producing medium of compressor 15 ejections.

The invention of eight aspect is such, in the invention of described first aspect, second aspect or the third aspect, allows cold-producing medium circulate in refrigerant loop 11 and the high pressure of the freeze cycle of carrying out is set to the value also higher than the critical pressure of this cold-producing medium; This refrigerating plant comprises controlling

organization

90, and 90 pairs of fluid flow governor motions 32 of this controlling organization are controlled, and makes the height of the freeze cycle of carrying out in described refrigerant loop 11 press to the control desired value of regulation.

The invention of the 9th aspect is such, in the invention of described fourth aspect, allows cold-producing medium circulate in refrigerant loop 11 and the high pressure of the freeze cycle of carrying out is set to the value also higher than the critical pressure of this cold-producing medium; This refrigerating plant comprises controlling

organization

90, and 90 pairs of fluid flow governor motions 32 of this controlling organization and gas flow control device 34 are controlled, and makes the height of the freeze cycle of carrying out in described refrigerant loop 11 press to the control desired value of regulation.

The invention of the tenth aspect is such, in the invention aspect the described the 6th, controlling organization 90 constitutes: set the control desired value according to the operating condition of freeze cycle, make the coefficient of performance of the freeze cycle of carrying out in refrigerant loop 11 become the maximum that can access under at that time the operating condition.

The invention of the tenth one side is such, aspect the described the 7th or in the invention of the 9th aspect, controlling organization 90 constitutes: set the control desired value according to the operating condition of freeze cycle, make the coefficient of performance of the freeze cycle of carrying out in refrigerant loop 11 become the maximum that can access under at that time the operating condition.

The invention of the 12 aspect is such, in the invention aspect the described the 9th, controlling organization 90 constitutes: set the control desired value according to the operating condition of freeze cycle, make the coefficient of performance of the freeze cycle of carrying out in refrigerant loop 11 become the maximum that can access under at that time the operating condition.

The invention of the 13 aspect is such, in the invention of the either side in aspect the described the 5th to the tenth, is filled with carbon dioxide in the refrigerant loop 11 and makes cold-producing medium.

-effect-in the invention of described first aspect, in refrigerant loop 11, be provided with decompressor 16.In refrigerant loop 11 from the cold-producing medium of compressor 15 ejection towards outdoor air heat release for example after, in decompressor 16, expand, then from air etc., absorb heat and evaporate, be inhaled into compressor 15 afterwards and be compressed.In refrigerant loop 11, cold-producing medium circulates like this and carries out freeze cycle.In refrigerant loop 11, be provided with cold-producing medium adjusting tank 14.This cold-producing medium adjusting tank 14 is adjusted in the refrigerant amount that circulates in the refrigerant loop 11 by the amount that is stored in inner liquid refrigerant is changed.

In refrigerant loop 11 of the present invention, can the liquid refrigerant in the cold-producing medium adjusting tank 14 be fed to the suction side of compressor 15 via liquid injection channel 31.Refrigerant flow in the liquid injection channel 31 is conditioned by control fluid flow governor motion 32.For example, if it is very high to be inhaled into the degree of superheat of cold-producing medium of compressor 15, it is too small that density becomes, then with can compare by the refrigerant amount of decompressor 16, can be just very few by the refrigerant amount of compressor 15, and the high pressure of freeze cycle can not be set at suitable value.This worry is arranged.Under these circumstances, if liquid refrigerant is fed to the suction side of compressor 15 via liquid injection channel 31, the density that then is inhaled into the cold-producing medium of compressor 15 will increase, can be by the cold-producing medium and the cold-producing medium balance that can pass through decompressor 16 of compressor 15.

In the invention of described second aspect, cold-producing medium adjusting tank 14 is configured in from the cold-producing medium circulation path of the evaporator to compressor 15 of refrigerant loop 11.In this refrigerant loop 11, the cold-producing medium that flows out from evaporimeter temporarily flows into the cold-producing medium adjusting tank 14.Afterwards, compressor 15 sucks the saturated gas cold-producing medium in the cold-producing medium adjusting tank 14.

In the invention of the described third aspect, cold-producing medium adjusting tank 14 is configured in decompressor 16 from refrigerant loop 11 to the cold-producing medium circulation path of evaporimeter.In this refrigerant loop 11, the cold-producing medium that flows out from decompressor 16 temporarily flows into the cold-producing medium adjusting tank 14.Saturated liquid cold-producing medium in the cold-producing medium adjusting tank 14 is supplied to evaporimeter.

In the invention of described fourth aspect, can spray the suction side that path 33 is supplied with the gas refrigerant in the cold-producing medium adjusting tank 14 on compressor 15 via gas.The refrigerant flow that gas sprays in the path 33 is conditioned by gas flow governor motion 34 is controlled.For example, if the cold-producing medium that is inhaled into compressor 15 becomes wet condition, it is excessive that density becomes, then with can compare by the refrigerant amount of decompressor 16, refrigerant amount that can be by compressor 15 just too much and can not be set at the high pressure of freeze cycle suitable value.This worry is arranged.Under these circumstances, if spray the suction side that path 33 feeds to gas refrigerant on compressor 15 via gas, the density that is inhaled into the cold-producing medium of compressor 15 will reduce, can be by the cold-producing medium and the cold-producing medium balance that can pass through decompressor 16 of compressor 15.

Aspect the described the 5th, in the invention of the 6th aspect and the 7th aspect, the high pressure of the freeze cycle of carrying out in refrigerant loop 11 is set to the value also higher than the critical pressure of this cold-producing medium.That is to say, become supercriticality from compressor 15 ejection side cold-producing mediums.

In the invention aspect the described the 6th, be provided with the controlling organization 90 that fluid flow governor motion 32 is controlled.If controlled by 90 pairs of fluid flow governor motions 32 of controlling organization, then spraying the flow that path 31 feeds to the cold-producing medium of the suction side that flows into compressor 15 via liquid will change.The suction cold-producing medium of compressor 15 is also followed in this and is changed, and the temperature of the ejection cold-producing medium of compressor 15 also can change.90 pairs of fluid flow governor motions 32 of controlling organization are controlled to regulate from liquid and are sprayed the refrigerant amount that path 31 feeds to compressor 15, and making becomes the control desired value of regulation from the temperature of the cold-producing medium of compressor 15 ejections.

In the invention aspect the described the 7th, be provided with the controlling organization 90 that fluid flow governor motion 32 and gas flow control device 34 are controlled.If controlled by 90 pairs of fluid flow governor motions 32 of controlling organization, then spraying the flow of cold-producing medium that path 31 feeds to the suction side of compressor 15 via liquid will change.If controlled by 90 pairs of gas flow governor motions 34 of controlling organization, then spraying the flow of cold-producing medium that path 33 feeds to the suction side of compressor 15 via gas will change.The density of the suction cold-producing medium of compressor 15 is followed in this and is changed, and the temperature of the ejection cold-producing medium of compressor 15 also can change.So, 90 pairs of fluid flow governor motions 32 of controlling organization are controlled to regulate from liquid and are sprayed the amount that path 31 feeds to the cold-producing medium of compressor 15, or gas flow governor motion 34 controlled to regulate from gas spray the amount that path 33 feeds to the cold-producing medium of compressor 15, making becomes the control desired value of regulation from the temperature of the cold-producing medium of compressor 15 ejections.

In the invention of described eight aspect, be provided with the controlling organization 90 that fluid flow governor motion 32 is controlled.If controlled by 90 pairs of fluid flow governor motions 32 of controlling organization, then spraying the flow of cold-producing medium that path 31 feeds to the suction side of compressor 15 via liquid will change, and the state of the suction cold-producing medium of compressor 15 also changes.Because the variable density of the ejection cold-producing medium of compressor 15 also changes so flow into the density of the cold-producing medium of decompressor 16, the high pressure of freeze cycle is also followed in this and is changed.Therefore, 90 pairs of fluid flow governor motions 32 of controlling organization are controlled to regulate from liquid and are sprayed the refrigerant amount that path 31 feeds to compressor 15, make the height of the freeze cycle of carrying out in refrigerant loop 11 press to the control desired value of regulation.

In the invention aspect the described the 9th, be provided with the controlling organization 90 that fluid flow governor motion 32 and gas flow control device 34 are controlled.If controlled by 90 pairs of fluid flow governor motions 32 of controlling organization, then spraying the flow of cold-producing medium that path 31 feeds to the suction side of compressor 15 via liquid will change.On the other hand, if controlled by 90 pairs of gas flow governor motions 34 of controlling organization, then spraying the flow of cold-producing medium that path 33 feeds to the suction side of compressor 15 via gas will change.If like this fluid flow governor motion 32, gas flow governor motion 34 are controlled, the state of the suction cold-producing medium of compressor 15 will change.So, because the variable density of the ejection cold-producing medium of compressor 15, also changing so flow into the density of the cold-producing medium of decompressor 16, the high pressure of freeze cycle is also followed in this and is changed.Therefore, 90 pairs of fluid flow governor motions 32 of controlling organization are controlled to regulate from liquid and are sprayed the amount that path 31 feeds to the cold-producing medium of compressor 15, or gas flow governor motion 34 controlled to regulate from gas spray the amount that path 33 feeds to the cold-producing medium of compressor 15, make the height of the freeze cycle of in refrigerant loop 11, carrying out press to the control desired value of regulation.

Aspect the described the tenth, the tenth on the one hand and in the invention of the 12 aspect, set the control desired value according to the operating condition of freeze cycle by controlling organization 90.At this moment, the value of controlling organization 90 decision control desired values makes the height of freeze cycle press to the value that can access maximum COP under at that time the operating condition.

In the invention aspect the described the 13, (CO2 makes cold-producing medium to be filled with carbon dioxide in the refrigerant loop 11.The effect of invention

In the present invention, in refrigerant loop 11, be provided with liquid and spray path 31.Can spray the suction side that path 31 feeds to liquid refrigerant on compressor 15 via liquid.So, if do not take some countermeasures can be by compressor 15 refrigerant amount and the balance of refrigerant amount that can decompressor 16 operating condition that can lose under, also can regulate the density of the suction cold-producing medium of compressor 15 by the suction side that liquid refrigerant is fed to compressor 15, make the two balance that the high pressure of freeze cycle is set at a suitable value.

So,, can be on one side all cold-producing mediums after the heat release be imported in the decompressor 16 with at that time state, allow to the refrigerant amount by compressor 15 on one side and can pass through the refrigerant amount balance of decompressor 16 according to the present invention.Therefore, according to the present invention, regardless of operating condition, can both make compressor 15 pass through refrigerant amount and decompressor 16 pass through the refrigerant amount balance, and can not reduce in the amount of power that decompressor 16 reclaims.

Particularly, in the invention of described fourth aspect, can utilize gas to spray the suction side that path 33 feeds to the gas refrigerant in the cold-producing medium adjusting tank 14 on compressor 15.Therefore, according to the present invention, if do not take some countermeasures can be by compressor 15 the refrigerant amount operating condition more too much than the refrigerant amount that can pass through decompressor 16 under, also can allow to refrigerant amount and the refrigerant amount balance that can pass through decompressor 16 by gas refrigerant is sprayed the suction side that path 33 feeds to compressor 15 from gas by compressor 15.

Aspect the described the tenth, the tenth on the one hand and in the invention of the 12 aspect, set the control desired values by controlling organization 90 and make and to access maximum COP under at that time the operating condition.Therefore,, can not only allow to refrigerant amount and the refrigerant amount balance that can pass through decompressor 16 by compressor 15 according to the invention of the tenth aspect, can also be with the operating condition optimization of freeze cycle.

[Fig. 1] is the piping diagram of the refrigerant loop of the related air conditioner of first embodiment of the present invention.[Fig. 2] is Mollier line chart (Mollier diagram) figure (pressure-enthalpy line chart) that is illustrated in the freeze cycle of carrying out in the refrigerant loop.[Fig. 3] is the piping diagram of the refrigerant loop of the related air conditioner of second embodiment.[Fig. 4] is the piping diagram of the refrigerant loop of the 3rd air conditioner that embodiment is related.[Fig. 5] is the piping diagram of the refrigerant loop of the 4th air conditioner that embodiment is related.[Fig. 6] is the piping diagram of the refrigerant loop of the related air conditioner of first variation of the 4th embodiment.[Fig. 7] is the piping diagram of the refrigerant loop of the related air conditioner of second variation of the 4th embodiment.[Fig. 8] is the piping diagram of refrigerant loop of the 3rd air conditioner that variation is related of the 4th embodiment.[Fig. 9] is the piping diagram of the refrigerant loop of the 5th air conditioner that embodiment is related.[Figure 10] is the piping diagram of the refrigerant loop of the 6th air conditioner that embodiment is related.[Figure 11] is the piping diagram of the refrigerant loop of the 7th air conditioner that embodiment is related.Figure 12] be the piping diagram of the refrigerant loop of the 8th air conditioner that embodiment is related.[Figure 13] is the piping diagram of the refrigerant loop of the related air conditioner of first variation of the 8th embodiment.[Figure 14] is the piping diagram of the refrigerant loop of the related air conditioner of second variation of the 8th embodiment.[Figure 15] is the piping diagram of refrigerant loop of the 3rd air conditioner that variation is related of the 8th embodiment.[Figure 16] is the piping diagram of refrigerant loop of the 4th air conditioner that variation is related of the 8th embodiment.[Figure 17] is the piping diagram of the refrigerant loop of the 9th air conditioner that embodiment is related.[Figure 18] is the piping diagram of the refrigerant loop of the tenth air conditioner that embodiment is related.The piping diagram of the refrigerant loop of the air conditioner that the variation of [Figure 19] the tenth embodiment is related.[Figure 20] is the piping diagram of the refrigerant loop of the related air conditioner of the 11 embodiment.The explanation of symbol

10 air conditioners (refrigerating plant), 11 refrigerant loops, 14 cold-producing medium adjusting tanks, 15 compressor 16 decompressors, 31 liquid injection pipes (liquid injection path) 32 hydraulic fluid side control valves (fluid flow governor motion) 33 gas injection tube roads (gas injection path) 34 gas side control valves (gas flow governor motion), 90 controlling organizations

Below, describe embodiments of the invention with reference to the accompanying drawings in detail.

(first embodiment of invention) describes first embodiment of the present invention.The air conditioner 10 of this embodiment has refrigerating plant involved in the present invention to constitute.

As shown in Figure 1, this air conditioner 10 has refrigerant loop 11.This refrigerant loop 11 is one to be filled with carbon dioxide (CO2 does the loop circuit of cold-producing medium.In refrigerant loop 11, be provided with: compressor 15, decompressor 16, outdoor heat converter 12, indoor heat converter 13 and cold-producing medium adjusting tank 14.And, also be provided with two four-way change-over

valves

21,22 in the refrigerant loop 11.

Described compressor 15 and decompressor 16 all are to be made of volume fluid machine (shaking piston-type rotary fluid machine, rolling piston type rotary fluid machine, scroll-type fluid machine etc.).Compressor 15 and decompressor 16 are in motor 17 is accommodated in a housing.Though do not show, compressor 15 and decompressor 16 and motor 17 are coupled together by an axle.

Described outdoor heat converter 12 and indoor heat converter 13 all are to be made of the pipe type heat exchanger that allows cold-producing medium and air carry out heat exchange.And described cold-producing medium adjusting tank 14 is one to form vertical high chest cylindraceous.

Described two four-way change-over

valves

21,22 comprise four ports respectively.Each four-way change-over

valve

21,22 freely switches between first state and second state.First state is: the state (state among Fig. 1 shown in the solid line) that first port and third connectivity mouth communicate and second port and four-way mouth communicate, second state are first port and the four-way mouth communicates and second port and third connectivity mouth communicate state (state shown in dotted lines in Figure 1).

Structure to described refrigerant loop 11 describes.The suction side of compressor 15 is connected on second port of the 1st four-way change-over valve 21, and the ejection side is connected on first port of the 1st four-way change-over valve 21.The third connectivity mouth of the 1st four-way change-over valve 21 is connected an end of outdoor heat converter 12, and the four-way mouth is connected an end of indoor heat converter 13.The inflow side of decompressor 16 is connected on the third connectivity mouth of the 2nd four-way change-over valve 22, and the outflow side is connected the top of cold-producing medium adjusting tank 14.The bottom of cold-producing medium adjusting tank 14 is connected on the four-way mouth of the 2nd four-way change-over valve 22.First port of the 2nd four-way change-over valve 22 is connected the other end of outdoor heat converter 12, and second port of the 2nd four-way change-over valve 22 is connected the other end of indoor heat converter 13.In this refrigerant loop 11, cold-producing medium adjusting tank 14 be set at from decompressor 16 to outdoor heat converter 12 and indoor heat converter 13 the evaporimeter effect that heat exchanger the cold-producing medium circulation path midway.

In the described refrigerant loop 11, be provided with the liquid injection pipe 31 that constitutes liquid injection path and constitute the gas injection tube road 33 that gas sprays path.One end of liquid injection pipe 31 is connected the bottom of cold-producing medium adjusting tank 14, and the other end is connected the suction side of compressor 15.Liquid injection pipe 31 be provided with the hydraulic fluid side control valve of using as the hydraulic fluid side flow control device 32 midway.One end in gas injection tube road 33 is connected the top of cold-producing medium adjusting tank 14, and the other end in gas injection tube road 33 is connected the suction side of compressor 15.Gas injection tube road 33 be provided with the gas side control valve of using as the gas flow governor motion 34 midway.Hydraulic fluid side control valve 32 and gas side control valve 34 all are to be made of the variable motor-driven valve of aperture.

In described air conditioner 10, be provided with controller 90 as controlling organization.This controller 90 constitutes: the aperture of regulator solution side control valve 32 and gas side control valve 34.Particularly, this controller 90 is set at the control desired value with the desired value of the ejection refrigerant temperature of compressor 15, and the aperture of regulator solution side control valve 32 and gas side control valve 34 makes the measured value of ejection refrigerant temperature of compressor 15 become the control desired value.At this moment, controller 90, the value that the coefficient of performance (COP) of freeze cycle under the operating condition is at this moment become the high pressure of maximum such freeze cycle is set at the control desired value.

-running action-the action of described air conditioner 10 is described.

(cooling operation) when carrying out cooling operation, the 1st four-way change-over valve 21 and the 2nd four-way change-over valve 22 are set to first state (state among Fig. 1 shown in the solid line), refrigerant loop 11 inner refrigerants according to Fig. 1 in the direction of arrow of solid line circulate.At this moment, outdoor heat converter 12 becomes gas cooler, and indoor heat converter 13 becomes evaporimeter.

Particularly, from the cold-producing medium of the supercriticality of compressor 15 ejection, inflow outdoor heat exchanger 12 flows into decompressor 16 afterwards to the outdoor air heat release.The cold-producing medium that has flowed in decompressor 16 expands, and the power that obtains therefrom conveys to compressor 15.The cold-producing medium of the gas-liquid two-phase system state that flows out from decompressor 16 is separated into liquid refrigerant and gas refrigerant after flowing into cold-producing medium adjusting tank 14.Go into indoor heat exchanger 13 from the liquid refrigerant streams that cold-producing medium adjusting tank 14 flows out, heat absorption from room air and evaporating.Room air is cooled dose of cooling in indoor heat converter 13.The cold-producing medium that evaporates at indoor heat converter 13 is inhaled into compressor 15 and is compressed.

(system warm running) when making warm running, the 1st four-way change-over valve 21 and the 2nd four-way change-over valve 22 are set to second state (state shown in dotted lines in Figure 1), refrigerant loop 11 inner refrigerants according to Fig. 1 in the direction of arrow of dotted line circulate.At this moment, indoor heat converter 13 becomes gas cooler, and outdoor heat converter 12 becomes evaporimeter.

Particularly, from the cold-producing medium of the supercriticality of compressor 15 ejection, inflow indoor heat exchanger 13 flows in the decompressor 16 afterwards to the room air heat release.Room air is heated by cold-producing medium in indoor heat converter 13.The cold-producing medium that has flowed in decompressor 16 expands, and the power that obtains therefrom conveys to compressor 15.The cold-producing medium of the gas-liquid two-phase system state that flows out from decompressor 16 is separated into liquid refrigerant and gas refrigerant after flowing into cold-producing medium adjusting tank 14.Go into outdoor heat converter 12 from the liquid refrigerant streams that cold-producing medium adjusting tank 14 flows out, heat absorption from outdoor air and evaporating.The cold-producing medium that evaporates at indoor heat converter 13 is inhaled into compressor 15 and is compressed.

The control action of-controller-at first illustrates how the operating condition of freeze cycle changes under the situation that allows the aperture of hydraulic fluid side control valve 32, gas side control valve 34 change.

In the Mollier line chart of Fig. 2 (pressure-enthalpy line chart), demonstration be that the steam pressure (that is low pressure of freeze cycle) of cold-producing medium is PL, the refrigerant temperature in gas cooler exit is the freeze cycle of Tgc.The freeze cycle of supposing the maximum coefficient of performance that can access under this operating condition is the freeze cycle of being represented by A-B-C-D.That is to say that supposing in the temperature from the cold-producing medium of compressor 15 ejection becomes under the situation of Td (that is the height of freeze cycle presses under the situation of PH), the COP of freeze cycle becomes maximum.

Remark additionally, the critical pressure that surpasses cold-producing medium at the high pressure of freeze cycle is under the so-called overcritical circulation, if the state of the cold-producing medium that has determined the evaporating pressure (that is low pressure of freeze cycle) of cold-producing medium, sucked by compressor 15 (particularly, the degree of superheat or humidity) and the refrigerant temperature of gas cooler outlet, just can become the high pressure of maximum freeze cycle according to the COP that they decide freeze cycle.

Suppose the freeze cycle of in refrigerant loop 11, carrying out by A '-B '-C '-D ' expression.At this moment, the state that is inhaled into the cold-producing medium of compressor 15 becomes the state of an A '.The density of the cold-producing medium under the some A ' state is lower than the density of the cold-producing medium under the some A condition.In this case, if from liquid injection pipe 31 feed fluid cold-producing mediums, or increase quantity delivered from the liquid refrigerant of liquid injection pipe 31, the cold-producing medium that then is inhaled into compressor 15 is just from the state of A ' state points of proximity A, and its density rises.Rise if be inhaled into the density of the cold-producing medium of compressor 15, the density that then is accompanied by the cold-producing medium of its inflow decompressor 16 also rises.So some C ' moves points of proximity C towards the direction that density increases on the thermoisopleth of temperature T gc.So the high pressure P H ' of freeze cycle rises, near pressure P H, the temperature of the ejection cold-producing medium of compressor 15 descends simultaneously, and near temperature T d, freeze cycle is whole near the desirable freeze cycle of being represented by A-B-C-D.

Suppose in refrigerant loop 11 and carry out by A "-B "-C "-D " expression freeze cycle.At this moment, the state that is inhaled into the cold-producing medium of compressor 15 becomes an A " state.Point A " density of state cold-producing medium down is lower than the density of putting the cold-producing medium under the A condition.In this case, if from the gas injection tube road 33 supply gas cold-producing mediums, or increase quantity delivered from the gas refrigerant in gas injection tube road 33, the cold-producing medium that then is inhaled into compressor 15 is just from an A " state of state points of proximity A, its density descends.Descend if be inhaled into the density of the cold-producing medium of compressor 15, the density that then is accompanied by the cold-producing medium of its inflow decompressor 16 also descends.So, some C " and the direction that reduces towards density on the thermoisopleth of temperature T gc moves points of proximity C.So, the high pressure P H of freeze cycle " rise, near pressure P H, the temperature of the ejection cold-producing medium of compressor 15 descends simultaneously, and near temperature T d, freeze cycle is whole near the desirable freeze cycle of being represented by A-B-C-D.

The control action of controller 90 then, is described.As mentioned above, by controller 90 set with from the relevant control desired value of the ejection refrigerant temperature of compressor 15.Particularly, controller 90 is obtained the measured value of the refrigerant temperature of the measured value of low pressure of freeze cycle and gas cooler outlet from sensor etc.On the other hand, this controller 90, the ejection refrigerant temperature that the COP of freeze cycle is become maximum compressor 15 stores in advance as the function of the refrigerant temperature at the low pressure of freeze cycle and gas cooler outlet place.At this moment, the state with the suction cold-producing medium of compressor 15 for example is set at " 5 ℃ of the degrees of superheat " or " saturation state " etc. in advance.The row operation of going forward side by side in the function that controller 90 has been stored obtained measured value substitution is set at the control desired value with the value that obtains therefrom.

Controller 90 is contrasted the measured value of the ejection refrigerant temperature of the control desired value set and compressor 15, controls the aperture of hydraulic fluid side control valve 32, gas side control valve 34 according to this result.

For example, suppose the measured value ratio control desired value height of the ejection refrigerant temperature of compressor 15.At this moment, if the state of gas side control valve 34 for opening, then controller 90 just makes the aperture of gas side control valve 34 reduce.Even gas side control valve 34 is for cutting out fully, still than control desired value height, controller 90 just increases the aperture of hydraulic fluid side control valve 32 measured value of the ejection refrigerant temperature of compressor 15.On the contrary, suppose compressor 15 the ejection refrigerant temperature measured value than control desired value be low.At this moment, if the state of hydraulic fluid side control valve 32 for opening, 90 apertures with hydraulic fluid side control valve 32 of controller reduce.Even hydraulic fluid side control valve 32 is for cutting out fully, the measured value of the ejection refrigerant temperature of compressor 15 is low than the control desired value, and controller 90 just increases the aperture of gas side control valve 34.

The effect of-first embodiment-in the air conditioner 10 of this embodiment, be provided with liquid injection pipe 31 in refrigerant loop 11 can be supplied with liquid refrigerant the suction side of compressor 15 via this liquid injection pipe 31.If do not take some countermeasures can be by compressor 15 refrigerant amount and the balance of refrigerant amount that can decompressor 16 operating condition that can lose under, also can regulate the density of the suction cold-producing medium of compressor 15 by the suction side of liquid refrigerant being supplied with compressor 15, make the two balance that the high pressure of freeze cycle is set at a suitable value.

Like this, according to this embodiment, the cold-producing medium that can the limit will flow out from gas cooler all imports decompressor 16 with at this moment state, and the limit makes by the refrigerant amount of compressor 15 and the refrigerant amount balance by decompressor 16.Therefore, according to this embodiment, regardless of operating condition, can both make compressor 15 pass through refrigerant amount and decompressor 16 pass through the refrigerant amount balance, and can not reduce in the amount of power that decompressor 16 reclaims.

In the air conditioner 10 of this embodiment, can utilize gas injection tube road 33 gas refrigerant in the cold-producing medium adjusting tank 14 to be fed to the suction side of compressor 15.Therefore, according to this embodiment, if do not take some countermeasures can be by compressor 15 the refrigerant amount operating condition more too much than the refrigerant amount that can pass through decompressor 16 under, also can allow to refrigerant amount and the refrigerant amount balance that can pass through decompressor 16 by suction side with gas refrigerant 33 supply compressors 15 from the gas injection tube road by compressor 15.

(second embodiment of invention) describes second embodiment of the present invention.The air conditioner 10 of this embodiment is that the structure of refrigerant loop 11 and controller 90 obtains in the air conditioner 10 among described first embodiment by changing.The air conditioner 10 and the different place of described first embodiment of this embodiment are described here.

As shown in Figure 3, in the refrigerant loop 11 of this embodiment, be provided with bridge loop 40 and replace the 2nd four-way change-over valve 22.Four non-return valves 41～44 are connected into the bridge shape promptly constitute described bridge loop 40.First non-return valve 41 in this bridge loop 40 and the inflow side of the 4th non-return valve 44 are connected the outflow side of decompressor 16, the outflow side of second non-return valve 42 and the 3rd non-return valve 43 is connected the inflow side of decompressor 16, the inflow side of the outflow side of first non-return valve 41 and second non-return valve 42 is connected the other end of indoor heat converter 13, and the outflow side of the inflow side of the 3rd non-return valve 43 and the 4th non-return valve 44 is connected to the other end of outdoor heat converter 12.

In the refrigerant loop 11 of this embodiment, the configuration of cold-producing medium adjusting tank 14 and described first embodiment's is different.In this refrigerant loop 11, that heat exchanger that cold-producing medium adjusting tank 14 is configured in evaporimeter effect from outdoor heat converter 12 and indoor heat converter 13 to the cold-producing medium circulation path of compressor 15 midway.Particularly, the top of this cold-producing medium adjusting tank 14 is connected second port of the 1st four-way change-over valve 21, and the top of cold-producing medium adjusting tank 14 is connected suction one side of compressor 15.

In the refrigerant loop 11 of this embodiment, only be provided with liquid injection pipe 31 and hydraulic fluid side control valve 32, gas injection tube road 33 and gas side control valve 34 have been omitted.In this refrigerant loop 11, an end of liquid injection pipe 31 is connected the bottom of cold-producing medium adjusting tank 14, and the other end is connected the suction side of compressor 15.The situation of this point and described first embodiment is the same.

Be accompanied by the omission of gas injection tube road 33 and gas side control valve 34, the controller 90 of this embodiment also constitutes the only aperture of regulator solution side control valve 32.That is to say that this controller 90 is set at the control desired value with the desired value of the ejection refrigerant temperature of compressor 15, the aperture of regulator solution side control valve 32 makes the measured value of ejection refrigerant temperature of compressor 15 become the control desired value.

-running action-the action of described air conditioner 10 is described.

(cooling operation) when carrying out cooling operation, the 1st four-way change-over valve 21 is set to first state (state among Fig. 3 shown in the solid line), refrigerant loop 11 inner refrigerants according to Fig. 3 in the solid arrow direction circulate.At this moment, outdoor heat converter 12 becomes gas cooler, and indoor heat converter 13 becomes evaporimeter.

Particularly, from the cold-producing medium of the supercriticality of compressor 15 ejection, inflow outdoor heat exchanger 12 flows in the decompressor 16 afterwards to the outdoor air heat release.The cold-producing medium that has flowed in decompressor 16 expands, and the power that obtains therefrom conveys to compressor 15.The cold-producing medium inflow indoor heat exchanger 13 of the gas-liquid two-phase system state that flows out from decompressor 16, heat absorption from room air and evaporating.Cooled dose of cooling of room air in indoor heat converter 13.Cold-producing medium by indoor heat converter 13 flows into cold-producing medium adjusting tank 14, and the gas refrigerant in the cold-producing medium adjusting tank 14 is inhaled into compressor 15 and is compressed.At this moment, liquid refrigerant is arranged, so the gas refrigerant that is inhaled into compressor 15 from cold-producing medium adjusting tank 14 becomes saturation state because of storing in the cold-producing medium adjusting tank 14.

(system warm running) when making warm running, the 1st four-way change-over valve 21 is set to second state (state shown in dotted lines in Figure 3), refrigerant loop 11 inner refrigerants according to Fig. 3 in the dotted arrow direction circulate.At this moment, indoor heat converter 13 becomes gas cooler, and outdoor heat converter 12 becomes evaporimeter.

Particularly, from the cold-producing medium of the supercriticality of compressor 15 ejection, inflow indoor heat exchanger 13 flows in the decompressor 16 afterwards to the room air heat release.Cooled dose of heating of room air in indoor heat converter 13.The cold-producing medium that has flowed in decompressor 16 expands, and the power that obtains therefrom conveys to compressor 15.The cold-producing medium of the gas-liquid two-phase system state that flows out from decompressor 16, inflow outdoor heat exchanger 12, heat absorption from outdoor air and evaporating.Cold-producing medium by outdoor heat converter 12 flows into cold-producing medium adjusting tank 14, and the gas refrigerant in the cold-producing medium adjusting tank 14 is inhaled into compressor 15 and is compressed.At this moment, liquid refrigerant is arranged, so the gas refrigerant that is inhaled into compressor 15 from cold-producing medium adjusting tank 14 becomes saturation state because of storing in the cold-producing medium adjusting tank 14.

The control action of-controller-described controller 90 set with from the relevant control desired value of the ejection refrigerant temperature of compressor 15.At this moment, the same with the situation of described first embodiment, controller 90 is set the control desired value.That is to say, controller 90 carries out computing according to the measured value of the refrigerant temperature at the measured value of the low pressure of freeze cycle and gas cooler outlet place, the COP that calculates freeze cycle becomes the ejection refrigerant temperature of maximum compressor 15, and this value is set at the control desired value.

Controller 90 is contrasted the measured value of the ejection refrigerant temperature of the control desired value set and compressor 15, controls the aperture of hydraulic fluid side control valve 32 according to this result.That is to say that if the measured value of the ejection refrigerant temperature of compressor 15 is bigger than the control desired value, 90 of controllers increase the aperture of hydraulic fluid side control valve 32; If the measured value of the ejection refrigerant temperature of compressor 15 is less than the control desired value, 90 of controllers dwindle the aperture of hydraulic fluid side control valve 32.

(the 3rd embodiment of invention) describes the 3rd embodiment of the present invention.The air conditioner 10 of this embodiment is that the structure by refrigerant loop 11 in the air conditioner 10 that changes described second embodiment obtains.The air conditioner 10 and described second different place of embodiment of this embodiment are described here.

As shown in Figure 4, in the refrigerant loop 11 of this embodiment, appended inner heat exchanger 50.Comprise first stream 51 and second stream 52 in the inner heat exchanger 50.Allow cold-producing medium in first stream 51 and the cold-producing medium in second stream 52 carry out heat exchange.And, in inner heat exchanger 50, big to the heat transfer area of first stream 51 towards the heat transfer area specific surface of second stream 52.First stream 51 in this inner heat exchanger 50 is connected on the pipeline between bridge loop 40 and the outdoor heat converter 12, and second stream 52 is connected on the pipeline between bridge loop 40 and the indoor heat converter 13.

-running action-when carrying out cooling operation, cold-producing medium in refrigerant loop 11 according to Fig. 4 in the direction shown in the solid arrow circulate.At this moment, in inner heat exchanger 50, the liquid refrigerant that flows out from outdoor heat converter 12 flows first stream 51, and the cold-producing medium of the gas-liquid two-phase state that flows out from decompressor 16 flows second stream 52.In other words, flow in second stream 52 that the cold-producing medium of gas-liquid two-phase state heat transfer area in inner heat exchanger 50 is bigger.Therefore, the heat exchange amount between the cold-producing medium in the cold-producing medium in first stream 51 and second stream 52 is more, and the temperature of liquid refrigerant descends greatlyyer in by that time of first stream 51.The cold-producing medium that temperature has descended in by that time of first stream 51 is sent in the decompressor 16 afterwards.So, in inner heat exchanger 50, be cooled and density becomes big cold-producing medium and is imported in the decompressor 16.

On the other hand, when making warm running, cold-producing medium in refrigerant loop 11 according to Fig. 4 in the direction shown in the dotted arrow circulate.At this moment, in inner heat exchanger 50, the gas-liquid two-phase system cryogen that flows out from decompressor 16 flows first stream 51, and the liquid refrigerant that flows out from indoor heat converter 13 flows second stream 52.In other words, flow in less first stream 51 of the cold-producing medium of gas-liquid two-phase state heat transfer area in inner heat exchanger 50.Therefore, the heat exchange amount between the cold-producing medium in the cold-producing medium in first stream 51 and second stream 52 tails off, and how many temperature of liquid refrigerant can not descend in by that time of first stream 51.Be sent to decompressor 16 after the cold-producing medium by first stream 51.So, in inner heat exchanger 50, be not cooled what and the almost indeclinable cold-producing medium of density is imported in the decompressor 16.

(the 4th embodiment of invention) describes the 4th embodiment of the present invention.The air conditioner 10 of this embodiment is to obtain by the structure that changes refrigerant loop 11 in the air conditioner 10 among described the 3rd embodiment.The air conditioner 10 and described the 3rd the different place of embodiment of this embodiment are described here.

As shown in Figure 5, in the refrigerant loop 11 of this embodiment, the configuration state of cold-producing medium adjusting tank 14 and described the 3rd embodiment's is different.In this refrigerant loop 11, cold-producing medium adjusting tank 14 be configured in from decompressor 16 to outdoor heat converter 12 and indoor heat converter 13 the evaporimeter effect that heat exchanger the cold-producing medium circulation path midway.

The 5th non-return valve 45 and the 6th non-return valve 46 in described refrigerant loop 11, have been appended.The 5th non-return valve 45 is configured on the pipeline that second stream 52 and indoor heat converter 13 with inner heat exchanger 50 couple together.Inflow side with the 5th non-return valve 45 is being provided with the 5th non-return valve 45 near indoor heat converter 13, outflow side near the state of inner heat exchanger 50.The 6th non-return valve 46 is set on the pipeline that first stream 51 and outdoor heat converter 12 with inner heat exchanger 50 couple together.Inflow side with the 6th non-return valve 46 is being provided with the 6th non-return valve 46 near outdoor heat converter 12, outflow side near the state of inner heat exchanger 50.

In described refrigerant loop 11, appended ingress pipe 60.One end of this ingress pipe 60 is connected the top of cold-producing medium adjusting tank 14, and the other end of this ingress pipe 60 branches into two branched pipes, and a branched pipe becomes first and imports branched pipe 61, and another branched pipe becomes second and imports branched pipe 62.First imports branched pipe 61 is connected between the 5th non-return valve 45 and the inner heat exchanger 50.This first is sought into branched pipe 61 and is provided with first magnetic valve 56.Second imports branched pipe 62 is connected between the 6th non-return valve 46 and the inner heat exchanger 50.This second importing branched pipe 62 is provided with second magnetic valve 57.

In described refrigerant loop 11, first delivery line 68 and second delivery line 69 have been appended.One end of first delivery line 68 is connected the bottom of cold-producing medium adjusting tank 14, and the other end is connected between indoor heat converter 13 and the 5th non-return valve 45.This first delivery line 68 is provided with the 7th non-return valve 47 that only allows cold-producing medium to flow to the other end from an end.One end of second delivery line 69 is connected the bottom of cold-producing medium adjusting tank 14, and the other end is connected between outdoor heat converter 12 and the 6th non-return valve 46.This second delivery line 69 is provided with the 8th check-valves 48 that only allows cold-producing medium to flow to the other end from an end.

Action-when carrying out cooling operation, first magnetic valve 56 is opened in-running, and second magnetic valve 57 cuts out.So, cold-producing medium in refrigerant loop 11 in Fig. 5 the direction shown in the solid arrow circulate.Particularly, the cold-producing medium of the gas-liquid two-phase state that flows out from decompressor 16 imports branched pipe 61 by first afterwards and flows in the cold-producing medium adjusting tanks 14 by second stream 52 of inner heat exchanger 50.The cold-producing medium that has flowed in cold-producing medium adjusting tank 14 is separated into liquid refrigerant and gas refrigerant.Liquid refrigerant in the cold-producing medium adjusting tank 14 is sent in the indoor heat converter 13 by behind first delivery line 68.

When making warm running, first magnetic valve 56 cuts out, and second magnetic valve 57 is opened.So, cold-producing medium in refrigerant loop 11 in Fig. 5 the direction shown in the dotted arrow circulate.Particularly, the cold-producing medium of the gas-liquid two-phase state that flows out from decompressor 16 imports branched pipe 62 by second afterwards and flows into cold-producing medium adjusting tanks 14 by first stream 51 of inner heat exchanger 50.The cold-producing medium that has flowed in cold-producing medium adjusting tank 14 is separated into liquid refrigerant and gas refrigerant.Liquid refrigerant in the cold-producing medium adjusting tank 14 is sent to outdoor heat converter 12 by behind second delivery line 69.

First variation of four embodiment of-Di-in this embodiment, make the structure of refrigerant loop 11 as follows.

As shown in Figure 6, in the refrigerant loop 11 in this variation, be provided with the 1st triple valve 26 and replace first magnetic valve 56 and second magnetic valve 57.The 1st triple valve 26 is set in the ingress pipe 60 first and imports the place that branched pipe 61 and second imports branched pipe 62 interflow.First imports branched pipe 61 is connected on second port of the 1st triple valve 26, and second imports branched pipe 62 is connected on the third connectivity mouth of the 1st triple valve 26.

In described refrigerant loop 11, be provided with delivery line 65 and replace first delivery line 68 and second delivery line 69.One end of this delivery line 65 is connected the bottom of cold-producing medium adjusting tank 14, and the other end of delivery line 65 branches into two branched pipes, and a branched pipe becomes the first derived score arm 66, and another branched pipe becomes the second derived score arm 67.The first derived score arm 66 is connected between indoor heat converter 13 and the 5th non-return valve 45.The second derived score arm 67 is connected between outdoor heat converter 12 and the 6th non-return valve 46.

This delivery line 65 is provided with the 2nd triple valve 27.The 2nd triple valve 27 is arranged on the place at the first derived score arm 66 and the second derived score arm, 67 interflow.The first derived score arm 66 is connected on second port of the 2nd triple valve 27, and the second derived score arm 67 is connected on the third connectivity mouth of the 2nd triple valve 27.

When carrying out cooling operation, the 1st triple valve 26 and the 2nd triple valve 27 all are set to the state (state among Fig. 6 shown in the solid line) that first port and second port communicate.So, cold-producing medium in refrigerant loop 11 according to Fig. 6 in the direction shown in the solid arrow circulate.Particularly, the cold-producing medium of the gas-liquid two-phase state that flows out from decompressor 16 by second stream 52 of inner heat exchanger 50, imports branched pipe 61 by first afterwards and flows in the cold-producing medium adjusting tanks 14.Liquid refrigerant in the cold-producing medium adjusting tank 14 is fed to indoor heat converter 13 by the first derived score arm 66.

On the other hand, when making warm running, the 1st triple valve 26 and the 2nd triple valve 27 all are set to the state (state shown in dotted lines in Figure 6) that first port and third connectivity mouth communicate.So, cold-producing medium in refrigerant loop 11 according to Fig. 6 in the direction shown in the dotted arrow circulate.Particularly, the cold-producing medium of the gas-liquid two-phase state that flows out from decompressor 16 by first stream 51 of inner heat exchanger 50, imports branched pipe 62 by second afterwards and flows in the cold-producing medium adjusting tanks 14.Liquid refrigerant in the cold-producing medium adjusting tank 14 is fed to outdoor heat converter 12 after by the second derived score arm 67.

Second variation of four embodiment of-Di-in this embodiment, make the structure of refrigerant loop 11 as follows.

As shown in Figure 7, in the refrigerant loop 11 of this variation, be provided with the 2nd four-way change-over valve 22 and replace bridge loop 40.First port of the 2nd four-way change-over valve 22 is connected on first stream 51 of inner heat exchanger 50, second port is connected on second stream 52 of inner heat exchanger 50, third connectivity mouth is connected the inflow side of decompressor 16, and the four-way mouth is connected the outflow side of decompressor 16.

In described refrigerant loop 11, first, second

magnetic valve

56,57 and the 5th to the 8th non-return valve 45～48 have omitted, and replace, and are provided with the 3rd four-way change-over valve 23 and the 4th four-way change-over valve 24.First port of the 3rd four-way change-over valve 23 is connected first and seeks out on the pipe 68, second port of the 3rd four-way change-over valve 23 is connected on second stream 52 of inner heat exchanger 50, the third connectivity mouth of the 3rd four-way change-over valve 23 is connected the other end of indoor heat converter 13, and the four-way mouth of the 3rd four-way change-over valve 23 is connected first and imports on the branched pipe 61.First port of the 4th four-way change-over valve 24 is connected the other end of outdoor heat converter 12, second port is connected second and imports on the branched pipe 62, third connectivity mouth is connected on first stream 51 of inner heat exchanger 50, and the four-way mouth is connected on second delivery line 69.

When carrying out cooling operation, all four-way change-over valves 21～24 all are set to the state shown in the solid line among Fig. 7.So, cold-producing medium in refrigerant loop 11 according to Fig. 7 in the direction shown in the arrow of solid line circulate.Particularly, the cold-producing medium of the gas-liquid two-phase state that flows out from decompressor 16 imports branched pipe 61 by first afterwards and flows in the cold-producing medium adjusting tanks 14 by second stream 52 of inner heat exchanger 50.Liquid refrigerant in the cold-producing medium adjusting tank 14 is sent in the indoor heat converter 13 after by the first derived score arm 66.

On the other hand, when making warm running, all four-way change-over valves 21～24 all are set to state shown in dotted lines in Figure 7.So, cold-producing medium in refrigerant loop 11 according to Fig. 7 in the direction shown in the arrow of dotted line circulate.Particularly, the cold-producing medium of the gas-liquid two-phase state that flows out from decompressor 16 imports branched pipe 62 by second afterwards and flows in the cold-producing medium adjusting tanks 14 by first stream 51 of inner heat exchanger 50.Liquid refrigerant in the cold-producing medium adjusting tank 14 is sent to outdoor heat converter 12 after by the second derived score arm 67.

The 3rd variation of four embodiment of-Di-in this embodiment, make the structure of refrigerant loop 11 as follows.

As shown in Figure 8, in the refrigerant loop 11 of this variation, be provided with the 2nd four-way change-over valve 22 and replace bridge loop 40.First port of the 2nd four-way change-over valve 22 is connected on the 3rd four-way change-over valve 23 described later, second port of the 3rd four-way change-over valve 23 is connected on second stream 52 of inner heat exchanger 50, the third connectivity mouth of the 3rd four-way change-over valve 23 is connected the inflow side of decompressor 16, and the four-way mouth of the 3rd four-way change-over valve 23 is connected the outflow side of decompressor 16.

In described refrigerant loop 11, the 6th non-return valve 46 has been omitted, and replaces, and has appended the 3rd four-way change-over valve 23 and the 3rd magnetic valve 58.First port of the 3rd four-way change-over valve 23 is connected the other end of outdoor heat converter 12, second port of the 3rd four-way change-over valve 23 is connected on first port of the 2nd four-way change-over valve 22, the third connectivity mouth of the 3rd four-way change-over valve 23 is connected an end of first stream 51 of inner heat exchanger 50, and the four-way mouth of the 3rd four-way change-over valve 23 is connected the other end of first stream 51 of inner heat exchanger 50.The 3rd magnetic valve 58 is configured between first stream 51 of the four-way mouth of the 3rd four-way change-over valve 23 and inner heat exchanger 50.

In described refrigerant loop 11, second link position that imports the branched pipe 62 and second delivery line 69 has been changed.Second imports branched pipe 62 is connected between first stream 51 and the 3rd magnetic valve 58 of inner heat exchanger 50.Second delivery line 69 is connected between the four-way mouth and the 3rd magnetic valve 58 of the 3rd four-way change-over valve 23.

When carrying out cooling operation, all four-way change-over valves 21～23 are set to the state shown in the solid line among Fig. 8, and first magnetic valve 56 and the 3rd magnetic valve 58 are opened simultaneously, and second magnetic valve 57 is closed.So, cold-producing medium in refrigerant loop 11 in Fig. 8 the direction shown in the arrow of solid line circulate.Particularly, the cold-producing medium of the gas-liquid two-phase state that flows out from decompressor 16 imports branched pipe 61 by first afterwards and flows into cold-producing medium adjusting tanks 14 by second stream 52 of inner heat exchanger 50.Liquid refrigerant in the cold-producing medium adjusting tank 14 is sent in the indoor heat converter 13 by behind first delivery line 68.

On the other hand, when making warm running, all four-way change-over valves 21～23 are set to state shown in dotted lines in Figure 8, and first magnetic valve 56 and the 3rd magnetic valve 58 are closed simultaneously, and second magnetic valve 57 is opened.So, cold-producing medium in refrigerant loop 11 in Fig. 8 the direction shown in the arrow of dotted line circulate.Particularly, the cold-producing medium of the gas-liquid two-phase state that flows out from decompressor 16 imports branched pipe 62 by second afterwards and flows in the cold-producing medium adjusting tanks 14 by first stream 51 of inner heat exchanger 50.Liquid refrigerant in the cold-producing medium adjusting tank 14 is by being sent in the outdoor heat converter 12 behind second delivery line 69.

(the 5th embodiment of invention) describes the 5th embodiment of the present invention.The air conditioner 10 of this embodiment is that the structure by refrigerant loop 11 in the air conditioner 10 that changes described first embodiment obtains.The air conditioner 10 and the different place of described first embodiment of this embodiment are described here.

As shown in Figure 9, in the refrigerant loop 11 of this embodiment, the configuring condition of the 1st four-way change-over valve 21 and the 2nd four-way change-over valve 22 and described first embodiment's is different.First port of the 1st four-way change-over valve 21 is connected the ejection side of compressor 15, second port of the 1st four-way change-over valve 21 is connected the bottom of cold-producing medium adjusting tank 14, the third connectivity mouth of the 1st four-way change-over valve 21 is connected an end of outdoor heat converter 12, and the four-way mouth of the 1st four-way change-over valve 21 is connected the other end of indoor heat converter 13.First port of the 2nd four-way change-over valve 22 is connected the other end of outdoor heat converter 12, second port of the 2nd four-way change-over valve 22 is connected an end of indoor heat converter 13, the third connectivity mouth of the 2nd four-way change-over valve 22 is connected the inflow side of decompressor 16, and the four-way mouth of the 2nd four-way change-over valve 22 is connected the suction side of compressor 15.Liquid injection pipe 31 and gas injection pipe 33 whichsoever all are connected between the suction side and the 2nd four-way change-over valve 22 of compressor 15.

Action-when carrying out cooling operation, the 1st four-way change-over valve 21 and the 2nd four-way change-over valve 22 all are set to first state (state among Fig. 9 shown in the solid line) in-running.So, cold-producing medium in refrigerant loop 11 in Fig. 9 the direction shown in the arrow of solid line circulate.That is to say, successively by outdoor heat converter 12, decompressor 16, cold-producing medium adjusting tank 14 and indoor heat converter 13, be inhaled into compressor 15 afterwards and be compressed from the cold-producing medium of compressor 15 ejection.

On the other hand, when making warm running, the 1st four-way change-over valve 21 and the 2nd four-way change-over valve 22 all are set to second state (state shown in dotted lines in Figure 9).So the direction shown in the arrow of cold-producing medium dotted line in Fig. 9 circulates in refrigerant loop 11.That is to say, successively by indoor heat converter 13, decompressor 16, cold-producing medium adjusting tank 14 and outdoor heat converter 12, be inhaled into compressor 15 afterwards and be compressed from the cold-producing medium of compressor 15 ejection.

(the 6th embodiment of invention) describes the 6th embodiment of the present invention.The air conditioner 10 of this embodiment is that the structure by refrigerant loop 11 in the air conditioner 10 that changes described the 5th embodiment obtains.The air conditioner 10 and described the 5th the different place of embodiment of this embodiment are described here.

As shown in figure 10, in the refrigerant loop 11 of this embodiment, the configuring condition of cold-producing medium adjusting tank 14 is different with described the 5th embodiment's.In this refrigerant loop 11, that heat exchanger that cold-producing medium adjusting tank 14 is set at evaporimeter effect from outdoor heat converter 12 and indoor heat converter 13 to the cold-producing medium circulation path of compressor 15 midway.Particularly, the top of this cold-producing medium adjusting tank 14 is connected on the four-way mouth of the 2nd four-way change-over valve 22, and the top is connected the suction side of compressor 15.Be accompanied by the change of the configuring condition of cold-producing medium adjusting tank 14, second port of the 1st four-way change-over valve 21 is connected the outflow side of decompressor 16.

In the refrigerant loop 11 of this embodiment, only be provided with liquid injection pipe 31 and hydraulic fluid side control valve 32, gas injection tube road 33 and gas side control valve 34 have been omitted.In this refrigerant loop 11, an end of liquid injection pipe 31 is connected the bottom of cold-producing medium adjusting tank 14, and the other end is connected the suction side of compressor 15.This point is the same with the situation of described the 5th embodiment.

Be accompanied by the omission of gas injection tube road 33 and gas side control valve 34, the controller 90 of this embodiment constitutes the only aperture of regulator solution side control valve 32.That is to say that this controller 90 is set at the control desired value with the desired value of the ejection refrigerant temperature of compressor 15, the aperture of regulator solution side control valve 32 makes the measured value of ejection refrigerant temperature of compressor 15 become the control desired value.That is to say that the structure of this controller 90 is the same with described second embodiment's.

Action-when carrying out cooling operation, the 1st four-way change-over valve 21 and the 2nd four-way change-over valve 22 all are set to first state (state among Figure 10 shown in the solid line) in-running.So, cold-producing medium in refrigerant loop 11 in Figure 10 the direction shown in the arrow of solid line circulate.That is to say, successively by outdoor heat converter 12, decompressor 16, indoor heat converter 13 and cold-producing medium adjusting tank 14, be inhaled into compressor 15 afterwards and be compressed from the cold-producing medium of compressor 15 ejection.

On the other hand, when making warm running, the 1st four-way change-over valve 21 and the 2nd four-way change-over valve 22 all are set to second state (state shown in dotted lines in Figure 10).So, cold-producing medium in refrigerant loop 11 in Figure 10 the direction shown in the arrow of dotted line circulate.That is to say, successively by indoor heat converter 13, decompressor 16, outdoor heat converter 12 and cold-producing medium adjusting tank 14, be inhaled into compressor 15 afterwards and be compressed from the cold-producing medium of compressor 15 ejection.

(the 7th embodiment of invention) describes the 7th embodiment of the present invention.The air conditioner 10 of this embodiment is that the structure by refrigerant loop 11 in the air conditioner 10 that changes described the 5th embodiment obtains.The air conditioner 10 and described the 5th the different place of embodiment of this embodiment are described here.

As shown in figure 11, in the refrigerant loop 11 of this embodiment, appended inner heat exchanger 50.This inner heat exchanger 50 constitutes and described the 3rd the same structure of embodiment.That is to say, in inner heat exchanger 50, be provided with first stream 51 and second stream 52, simultaneously, big to the heat transfer area of second stream 52 towards the heat transfer area specific surface of first stream 51.First stream 51 of this inner heat exchanger 50 is connected between first port and outdoor heat converter 12 of the 2nd four-way change-over valve 22, and second stream 52 is connected between second port and indoor heat converter 13 of the 2nd four-way change-over valve 22.

Action-when carrying out cooling operation, the 1st four-way change-over valve 21 and the 2nd four-way change-over valve 22 all are set to first state (state among Figure 11 shown in the solid line) in-running.So, cold-producing medium in refrigerant loop 11 in Figure 11 the direction shown in the arrow of solid line circulate.That is to say that the cold-producing medium from the outdoor heat converter 12 of gas cooler effect flows out flows in the decompressor 16 after first stream 51 by inner heat exchanger 50.After second stream 52 of cold-producing medium that the indoor heat converter 13 of evaporimeter effect flows out, be inhaled into compressor 15 by inner heat exchanger 50.

On the other hand, when making warm running, the 1st four-way change-over valve 21 and the 2nd four-way change-over valve 22 all are set to second state (state shown in dotted lines in Figure 11).So, cold-producing medium in refrigerant loop 11 in Figure 11 the direction shown in the arrow of dotted line circulate.That is to say that the cold-producing medium from the indoor heat converter 13 of gas cooler effect flows out flows in the decompressor 16 after second stream 52 by inner heat exchanger 50.After first stream 51 of cold-producing medium that the outdoor heat converter 12 of evaporimeter effect flows out, be inhaled into the compressor 15 by inner heat exchanger 50.

(the 8th embodiment of invention) describes the 8th embodiment of the present invention.The air conditioner 10 of this embodiment is that the structure by refrigerant loop 11 and controller 90 in the air conditioner 10 that changes described the 7th embodiment obtains.The air conditioner 10 and described the 7th the different place of embodiment of this embodiment are described here.

As shown in figure 12, in the refrigerant loop 11 of this embodiment, first magnetic valve 71 and second magnetic valve 72 have been appended.First magnetic valve 71 is configured between second stream 52 and indoor heat converter 13 of inner heat exchanger 50.Second magnetic valve 72 is configured between first stream 51 and outdoor heat converter 12 of inner heat exchanger 50.

In described refrigerant loop 11, the configuring condition of cold-producing medium adjusting tank 14 is different with described the 7th embodiment's.In this refrigerant loop 11, that heat exchanger that cold-producing medium adjusting tank 14 is set at evaporimeter effect from outdoor heat converter 12 and indoor heat converter 13 to the cold-producing medium circulation path of compressor 15 midway.

Be accompanied by the change of the configuring condition of cold-producing medium adjusting tank 14, in described refrigerant loop 11, the outflow side of decompressor 16 is connected on second port of the 1st four-way change-over valve 21.First ingress pipe 63, second ingress pipe 64 and delivery line 65 in this refrigerant loop 11, have been appended.

One end of described first ingress pipe 63 is connected the top of cold-producing medium adjusting tank 14, and the other end is connected between the indoor heat converter 13 and first magnetic valve 71.This first ingress pipe 63 is provided with the 3rd magnetic valve 73.One end of described second ingress pipe 64 is connected the top of cold-producing medium adjusting tank 14, and the other end is connected between the outdoor heat converter 12 and second magnetic valve 72.This second ingress pipe 64 is provided with the 4th magnetic valve 74.

One end of described delivery line 65 is connected the top of cold-producing medium adjusting tank 14, and the other end of delivery line 65 branches into two branched pipes, and a branched pipe becomes the first derived score arm 66, and another branched pipe becomes the second derived score arm 67.The first derived score arm 66 is connected between second stream 52 and first magnetic valve 71 of inner heat exchanger 50.This first derived score arm 66 is provided with first non-return valve 76.First non-return valve 76 only allows cold-producing medium to flow towards the direction that flows out from cold-producing medium adjusting tank 14, the second derived score arm 67 is connected between first stream 51 and second magnetic valve 72 of inner heat exchanger 50, and this second derived score arm 67 is provided with second non-return valve 77.This second non-return valve 77 only allows cold-producing medium to flow towards the direction that flows out from cold-producing medium adjusting tank 14.

In the refrigerant loop 11 of this embodiment, only be provided with liquid injection pipe 31 and hydraulic fluid side control valve 32, gas injection tube road 33 and gas side control valve 34 have been omitted.In this refrigerant loop 11, an end of liquid injection pipe 31 is connected the bottom of cold-producing medium adjusting tank 14, and the other end is connected the suction side of compressor 15.This point is the same with the situation of described the 7th embodiment.

When carrying out cooling operation, second magnetic valve 72 and the 3rd magnetic valve 73 are opened, and first magnetic valve 71 and the 4th magnetic valve 74 are closed.So, cold-producing medium in refrigerant loop 11 in Figure 12 the direction shown in the arrow of solid line circulate.Particularly, the cold-producing medium that flows out from indoor heat converter 13 flows into the cold-producing medium adjusting tank 14 by first ingress pipe 63.Gas refrigerant in the cold-producing medium adjusting tank 14 flows into inner heat exchanger 50 by the first derived score arm 66, by being inhaled in the compressor 15 behind this second stream 52.

On the other hand, when making warm running, second magnetic valve 72 and the 3rd magnetic valve 73 are closed, and first magnetic valve 71 and the 4th magnetic valve 74 are opened.So, cold-producing medium in refrigerant loop 11 in Figure 12 the direction shown in the arrow of dotted line circulate.Particularly, the cold-producing medium that flows out from outdoor heat converter 12 flows into the cold-producing medium adjusting tank 14 by second ingress pipe 64.Cold-producing medium in the cold-producing medium adjusting tank 14 flows into inner heat exchanger 50 by the second derived score arm 67, by being inhaled into compressor 15 behind this first stream 51.

First variation of eight embodiment of-Di-in this embodiment, make the structure of refrigerant loop 11 as follows.

As shown in figure 13, in the refrigerant loop 11 of this variation, first to the 4th magnetic valve 71～74 is omitted, and replaces, and is provided with the 1st triple valve 26 and the 2nd triple valve 27.

The 1st triple valve 26 is set at pipeline that second stream 52 with indoor heat converter 13 and inner heat exchanger 50 couples together midway, first port of the 1st triple valve 26 is connected on the indoor heat converter 13, and the third connectivity mouth of the 1st triple valve 26 is connected on second stream 52 of inner heat exchanger 50.First ingress pipe 63 is connected on second port of the 1st triple valve 26.

The 2nd triple valve 27 is set at pipeline that first stream 51 with outdoor heat converter 12 and inner heat exchanger 50 couples together midway.First port of the 2nd triple valve 27 is connected on the outdoor heat converter 12, and second port of the 2nd triple valve 27 is connected on first stream 51 of inner heat exchanger 50.Second ingress pipe 64 is connected on the third connectivity mouth of the 2nd triple valve 27.

When carrying out cooling operation, the 1st triple valve 26 and the 2nd triple valve 27 all are set to the state (state among Figure 13 shown in the solid line) that first port and second port communicate.So, cold-producing medium in refrigerant loop 11 just according to Figure 13 in the direction shown in the arrow of solid line circulate.Particularly, the cold-producing medium from indoor heat converter 13 flows out flows in the cold-producing medium adjusting tank 14 by first ingress pipe 63.Gas refrigerant in the cold-producing medium adjusting tank 14 flows in the inner heat exchanger 50 by the first derived score arm 66, is inhaled in the compressor 15 behind second stream 52 by inner heat exchanger 50.

On the other hand, when making warm running, the 1st triple valve 26 and the 2nd triple valve 27 all are set to the state (state shown in dotted lines in Figure 13) that first port and third connectivity mouth communicate.So, cold-producing medium in refrigerant loop 11 just according to Figure 13 in the direction shown in the arrow of dotted line circulate.Particularly, the cold-producing medium from outdoor heat converter 12 flows out flows in the cold-producing medium adjusting tank 14 by second ingress pipe 64.Gas refrigerant in the cold-producing medium adjusting tank 14 flows in the inner heat exchanger 50 by the second derived score arm 67, is inhaled in the compressor 15 behind second stream 52 by inner heat exchanger 50.

Second variation of eight embodiment of-Di-in this embodiment, make the structure of refrigerant loop 11 as follows.

As shown in figure 14, in the refrigerant loop 11 of this variation, first to the 4th magnetic valve 71～74 and first, second

non-return valve

76,77 are omitted, and replace, and are provided with the 3rd four-way change-over valve 23 and the 4th four-way change-over valve 24.

Described the 3rd four-way change-over valve 23 is set at pipeline that second stream 52 with indoor heat converter 13 and inner heat exchanger 50 couples together midway, first port of the 3rd four-way change-over valve 23 is connected on the indoor heat converter 13, and the four-way mouth of the 3rd four-way change-over valve 23 is connected on second stream 52 of inner heat exchanger 50.The first derived score arm 66 is connected on second port of the 3rd four-way change-over valve 23, and first ingress pipe 63 is connected on the third connectivity mouth of the 3rd four-way change-over valve 23.

Described the 4th four-way change-over valve 24 is set at pipeline that first stream 51 with outdoor heat converter 12 and inner heat exchanger 50 couples together midway.First port of the 4th four-way change-over valve 24 is connected on the outdoor heat converter 12, and the third connectivity mouth of the 4th four-way change-over valve 24 is connected on first stream 51 of inner heat exchanger 50.The second derived score arm 67 is connected on second port of the 4th four-way change-over valve 24, and second ingress pipe 64 is connected on the four-way mouth of the 4th four-way change-over valve 24.

When carrying out cooling operation, not only the 1st, the 2nd four-way change-over

valve

21,22 is set to the state shown in the solid line among Figure 14, and the 3rd, the 4th four-way change-over

valve

23,24 also is set to the state shown in the solid line among Figure 14.So in this refrigerant loop 11, cold-producing medium circulates according to the direction shown in the arrow of solid line among Figure 14.Particularly, the cold-producing medium that flows out from indoor heat converter 13 flows into cold-producing medium adjusting tank 14 by first ingress pipe 63.Gas refrigerant in the cold-producing medium adjusting tank 14 flows in the inner heat exchanger 50 by the first derived score arm 66, is inhaled in the compressor 15 behind second stream 52 by inner heat exchanger 50.

On the other hand, when making warm running, not only the 1st, the 2nd four-way change-over

valve

21,22 is set to state shown in dotted lines in Figure 14, and the 3rd, the 4th four-way change-over

valve

23,24 also is set to state shown in dotted lines in Figure 14.So in this refrigerant loop 11, cold-producing medium circulates according to the direction shown in the arrow of dotted line among Figure 14.Particularly, the cold-producing medium from outdoor heat converter 12 flows out flows in the cold-producing medium adjusting tank 14 by second ingress pipe 64.Gas refrigerant in the cold-producing medium adjusting tank 14 flows in the inner heat exchanger 50 by the second derived score arm 67, is inhaled in the compressor 15 behind first stream 51 by inner heat exchanger 50.

The 3rd variation of eight embodiment of-Di-in this embodiment, make the structure of refrigerant loop 11 as follows.

As shown in figure 15, in the refrigerant loop 11 of this variation, appended the 3rd four-way change-over valve 23.And, in this refrigerant loop 11, be provided with ingress pipe 60 and replace first,

second ingress pipe

63,64.

In described refrigerant loop 11, the 3rd four-way change-over valve 23 is configured in the part that arrives the 2nd four-way change-over valve 22 from outdoor heat converter 12 via first stream 51 of inner heat exchanger 50.Particularly.First port of the 3rd four-way change-over valve 23 is connected the other end of outdoor heat converter 12, second port of the 3rd four-way change-over valve 23 is connected on first port of the 2nd four-way change-over valve 22, the third connectivity mouth of the 3rd four-way change-over valve 23 is connected an end of first stream 51 of inner heat exchanger 50, and the four-way mouth of the 3rd four-way change-over valve 23 is connected the other end of first stream 51 of inner heat exchanger 50.And, in this refrigerant loop 11, also be that second magnetic valve 72 is configured between the four-way mouth and inner heat exchanger 50 of the 3rd four-way change-over valve 23.Remark additionally, in this refrigerant loop 11, the second derived score arm 67 is connected between first stream 51 and second magnetic valve 72 of inner heat exchanger 50.

One end of described first ingress pipe 60 is connected the top of cold-producing medium adjusting tank 14, and the other end of ingress pipe 60 branches into two branched pipes, and a branched pipe becomes first and imports branched pipe 61, and another branched pipe becomes second and imports branched pipe 62.First imports branched pipe 61 is connected between the indoor heat converter 13 and first magnetic valve 71.This first importing branched pipe 61 is provided with the 3rd magnetic valve 73.Second imports branched pipe 62 is connected between the four-way mouth and second magnetic valve 72 of the 3rd four-way change-over valve 23.This second importing branched pipe 62 is provided with the 4th magnetic valve 74.

valve

21,22 is set to the state shown in the solid line among Figure 15, and the 3rd four-way change-over valve 23 also is set to the state shown in the solid line among Figure 15.And second magnetic valve 72 and the 3rd magnetic valve 73 are opened, and first magnetic valve 71 and the 4th magnetic valve 74 are closed.So, cold-producing medium in refrigerant loop 11 in Figure 15 the direction shown in the arrow of solid line circulate.Particularly, the cold-producing medium that flows out from indoor heat converter 13 imports branched pipe 61 by first and flows into cold-producing medium adjusting tank 14.Gas refrigerant in the cold-producing medium adjusting tank 14 flows in the inner heat exchanger 50 by the first derived score arm 66, is inhaled in the compressor 15 behind second stream 52 by inner heat exchanger 50.

valve

21,22 is set to state shown in dotted lines in Figure 15, and the 3rd four-way change-over valve 23 also is set to state shown in dotted lines in Figure 15.And second magnetic valve 72 and the 3rd magnetic valve 73 are closed, and first magnetic valve 71 and the 4th magnetic valve 74 are opened.So, cold-producing medium in refrigerant loop 11 in Figure 15 the direction shown in the arrow of dotted line circulate.Particularly, the cold-producing medium that flows out from outdoor heat converter 12 imports the branched pipe 62 inflow cold-producing medium adjusting tanks 14 by second.Gas refrigerant in the cold-producing medium adjusting tank 14 flows in the inner heat exchanger 50 by the second derived score arm 67, is inhaled in the compressor 15 behind first stream 51 by inner heat exchanger 50.

The 4th variation of eight embodiment of-Di-in this embodiment, can make the structure of refrigerant loop 11 as follows.This variation is (to obtain after with reference to the structural change of Figure 14 with inner heat exchanger 50 in second variation of this embodiment.

As shown in figure 16, in the inner heat exchanger 50 of this embodiment, except being provided with first stream 51 and second stream 52, also be provided with the 3rd stream 53.This inner heat exchanger 50 constitutes: allow cold-producing medium in first stream 51 and the cold-producing medium in second stream 52 carry out heat exchange, allow cold-producing medium in first stream 51 and the cold-producing medium in the 3rd stream 53 carry out heat exchange.And, in inner heat exchanger 50, big to the heat transfer area of first stream 51, the 3rd stream 53 towards the heat transfer area specific surface of second stream 52.

One end of first stream 51 of described inner heat exchanger 50 is connected on the third connectivity mouth of the 4th four-way change-over valve 24, and the other end is connected on first port of the 2nd four-way change-over valve 22.One end of second stream 52 of inner heat exchanger 50 is connected on the four-way mouth of the 2nd four-way change-over valve 22, and the other end is connected the suction side of compressor 15.One end of the 3rd stream 53 of inner heat exchanger 50 is connected on the four-way mouth of the 3rd four-way change-over valve 23, and the other end is connected on second port of the 2nd four-way change-over valve 22.

valve

21,22 is set to the state shown in the solid line among Figure 16, and the 3rd, the 4th four-way change-over

valve

23,24 also is set to the state shown in the solid line among Figure 16.So in this refrigerant loop 11, cold-producing medium circulates according to the direction shown in the arrow of solid line among Figure 16.Particularly, the cold-producing medium that flows out from indoor heat converter 13 flows into the cold-producing medium adjusting tank 14 by first ingress pipe 63.Gas refrigerant in the cold-producing medium adjusting tank 14 flows in the inner heat exchanger 50, by the 3rd stream 53 of inner heat exchanger 50 by the first derived score arm, 66 backs.By the cold-producing medium of the 3rd stream 53, flow into second stream 52 of inner heat exchanger 50 afterwards, be inhaled in the compressor 15 behind second stream 52 by inner heat exchanger 50.And the cold-producing medium that flows out from outdoor heat converter 12 flows into first stream 51 of inner heat exchanger 50, flows in decompressors 16 by these first stream, 51 backs.

valve

21,22 is set to the state shown in the dotted line among Figure 16, and the 3rd, the 4th four-way change-over

valve

23,24 also is set to the state shown in the dotted line among Figure 16.So in this refrigerant loop 11, cold-producing medium circulates according to the direction shown in the arrow of dotted line among Figure 16.Particularly, the cold-producing medium that flows out from outdoor heat converter 12 flows into the cold-producing medium adjusting tank 14 by second ingress pipe 64.Gas refrigerant in the cold-producing medium adjusting tank 14 flows in the inner heat exchanger 50, by first stream 51 of inner heat exchanger 50 by the second derived score arm 67.By the cold-producing medium of first stream 51, flow into second stream 52 of inner heat exchanger 50 afterwards, by being inhaled in the compressor 15 behind second stream 52.And the cold-producing medium that flows out from indoor heat converter 13 flows into the 3rd stream 53 of inner heat exchanger 50, flows in the decompressors 16 by the 3rd stream 53 backs.

(the 9th embodiment of invention) describes the 9th embodiment of the present invention.The air conditioner 10 of this embodiment is that the structure by refrigerant loop 11 in the air conditioner 10 that changes described first embodiment obtains.The air conditioner 10 and the different place of described first embodiment of this embodiment are described here.

As shown in figure 17, appended inner heat exchanger 50 in the refrigerant loop 11 of this embodiment.This inner heat exchanger 50 comprises first stream 51 and second stream 52, allows cold-producing medium in first stream 51 and the cold-producing medium in second stream 52 carry out heat exchange.First stream 51 of inner heat exchanger 50 is configured in pipeline that second port and indoor heat converter 13 with the 2nd four-way change-over valve 22 couple together midway.On the other hand, second stream 52 of inner heat exchanger 50 is configured in pipeline that third connectivity mouth and decompressor 16 with the 2nd four-way change-over valve 22 couple together midway.

-running action-when carrying out cooling operation, cold-producing medium in refrigerant loop 11 according to Figure 17 in the direction shown in the arrow of solid line circulate.At this moment, the liquid refrigerant that flows out from cold-producing medium adjusting tank 14 flows into first stream 51 of inner heat exchanger 50.The cold-producing medium that flows out from outdoor heat converter 12 flows into second stream 52 of inner heat exchanger 50.In inner heat exchanger 50, the cold-producing medium that flows in second stream 52 is by the refrigerant cools that flows in first stream 51.So the cold-producing medium that is cooled when second stream 52 by inner heat exchanger 50 is imported in the decompressor 16.

On the other hand, when making warm running, cold-producing medium in refrigerant loop 11 according to Figure 17 in the direction shown in the arrow of dotted line circulate.At this moment, the liquid refrigerant that flows out from cold-producing medium adjusting tank 14 is by inner heat exchanger 50 just the inflow outdoor heat exchanger 12.The cold-producing medium that flows out from indoor heat converter 13 flows in second stream 52 of inner heat exchanger 50 afterwards by first stream 51 of inner heat exchanger 50.Therefore, in inner heat exchanger 50, carry out heat exchange hardly between the cold-producing medium in the cold-producing medium in first stream 51 and second stream 52.The result is, the cold-producing medium of second stream 52 by inner heat exchanger 50 flows into the decompressor 16 with the state when indoor heat converter 13 flows out substantially.

(the tenth embodiment of invention) describes the of the present invention ten embodiment.The air conditioner 10 of this embodiment is that the structure by refrigerant loop 11 and controller 90 in the air conditioner 10 that changes described the 9th embodiment obtains.The air conditioner 10 and described the 9th the different place of embodiment of this embodiment are described here.

As shown in figure 18, in the refrigerant loop 11 of this embodiment, the configuring condition of cold-producing medium adjusting tank 14 and described the 9th embodiment's is different.In this refrigerant loop 11, that heat exchanger that cold-producing medium adjusting tank 14 is configured in evaporimeter effect from outdoor heat converter 12 and indoor heat converter 13 to the cold-producing medium circulation path of compressor 15 midway.Be accompanied by the change of the configuring condition of cold-producing medium adjusting tank 14, in this refrigerant loop 11, the outflow side of decompressor 16 is connected on the four-way mouth of the 2nd four-way change-over valve 22.And the configuring condition of inner heat exchanger 50 and described the 9th embodiment's is different in this refrigerant loop 11.

Particularly, the bottom of cold-producing medium adjusting tank 14 is connected on second port of the 1st four-way change-over valve 21.One end of first stream 51 of inner heat exchanger 50 is connected the top of cold-producing medium adjusting tank 14, and the other end is connected the suction side of compressor 15.Remark additionally, this point midway that second stream 52 of inner heat exchanger 50 is configured in the pipeline that the third connectivity mouth of the 2nd four-way change-over valve 22 and decompressor 16 are coupled together is the same with the situation of described the 9th embodiment.

In described refrigerant loop 11, be provided with first magnetic valve 81 and bypass duct 80.First magnetic valve 81 is configured between second stream 52 of the third connectivity mouth of the 2nd four-way change-over valve 22 and inner heat exchanger 50.One end of bypass duct 80 is connected between the 2nd four-way change-over valve 22 and first magnetic valve 81, and the other end of bypass duct 80 is connected between second stream 52 and decompressor 16 of inner heat exchanger 50.This bypass duct 80 is provided with second magnetic valve 82.

In the refrigerant loop 11 of this embodiment, only be provided with liquid injection pipe 31 and hydraulic fluid side control valve 32, gas injection tube road 33 and gas side control valve 34 have been omitted.In this refrigerant loop 11, an end of liquid injection pipe 31 is connected the bottom of cold-producing medium adjusting tank 14, and the other end of liquid injection pipe 31 is connected the suction side of compressor 15.The situation of this point and described first embodiment is the same.

Be accompanied by the omission of gas injection tube road 33 and gas side control valve 34, the controller 90 of this embodiment also constitutes the only aperture of regulator solution side control valve 32.That is to say that this controller 90 is set at the control desired value with the desired value of the ejection refrigerant temperature of compressor 15, the aperture of regulator solution side control valve 32 makes the measured value of ejection refrigerant temperature of compressor 15 become the control desired value.That is to say that the structure of this controller 90 is the same with the structure of described second embodiment.

Action-when carrying out cooling operation, first magnetic valve 81 is opened in-running, and second motor-driven valve 82 is closed.So, cold-producing medium in refrigerant loop 11 according to Figure 18 in the direction shown in the arrow of solid line circulate.Particularly, the cold-producing medium that flows out from outdoor heat converter 12 flows into second stream 52 of inner heat exchanger 50.Flow into first stream 51 of inner heat exchanger 50 from cold-producing medium adjusting tank 14 effluent air cold-producing mediums.In inner heat exchanger 50, the cold-producing medium that flows in second stream 52 is by the refrigerant cools that flows in first stream 51.The cold-producing medium that is cooled when second stream 52 by inner heat exchanger 50 is imported in the decompressor 16.

On the other hand, when making warm running, first magnetic valve 81 is closed, and second motor-driven valve 82 is opened.Cold-producing medium in refrigerant loop 11 according to Figure 18 in the direction shown in the arrow of dotted line circulate.Particularly, the cold-producing medium from indoor heat converter 13 flows out flows into bypass duct 80, does not just flow in the decompressor 16 via inner heat exchanger 50.That is to say that the cold-producing medium that flows into decompressor 16 roughly becomes with the state when indoor heat converter 13 flows out.Be inhaled into the compressor 15 from first stream 51 of cold-producing medium adjusting tank 14 effluent air cold-producing mediums by inner heat exchanger 50.

The variation of ten embodiment of-Di-in this embodiment, can make the structure of refrigerant loop 11 as follows.

As shown in figure 19, in the refrigerant loop 11 of this variation, the configuring condition of inner heat exchanger 50 and bypass duct 80 has been changed.

One end of first stream 51 of described inner heat exchanger 50 is connected on the four-way mouth of the 2nd four-way change-over valve 22, and the other end is connected the top of cold-producing medium adjusting tank 14.Remark additionally, this point midway that second stream 52 of inner heat exchanger 50 is configured in the pipeline that the third connectivity mouth of the 2nd four-way change-over valve 22 and decompressor 16 are coupled together is the same.

In the refrigerant loop 11 of this variation, first magnetic valve 81 is configured between first stream 51 and cold-producing medium adjusting tank 14 of inner heat exchanger 50.In this refrigerant loop 11, an end of bypass duct 80 is connected between first stream 51 and the 2nd four-way change-over valve 22 of inner heat exchanger 50, and the other end of bypass duct 80 is connected between first magnetic valve 81 and the cold-producing medium adjusting tank 14.Remark additionally, it is the same that bypass duct 80 is provided with second motor-driven valve, 82 this point.

When carrying out cooling operation, first magnetic valve 81 is opened, and second motor-driven valve 82 is closed.So, cold-producing medium in refrigerant loop 11 according to Figure 19 in the direction shown in the arrow of solid line circulate.Particularly, the cold-producing medium that flows out from outdoor heat converter 12 flows into second stream 52 of inner heat exchanger 50.Flow into first stream 51 of inner heat exchanger 50 from indoor heat converter 13 effluent air cold-producing mediums.In inner heat exchanger 50, the cold-producing medium that flows in second stream 52 is by the refrigerant cools that flows in first stream 51.The cold-producing medium that is cooled when second stream 52 by inner heat exchanger 50 is imported in the decompressor 16.

On the other hand, when making warm running, first magnetic valve 81 is closed, and second motor-driven valve 82 is opened.Cold-producing medium in refrigerant loop 11 according to Figure 19 in the direction shown in the arrow of dotted line circulate.Particularly, the cold-producing medium from outdoor heat converter 12 flows out flows into bypass duct 80, is not inhaled in the compressor 15 via inner heat exchanger 50.Cold-producing medium from indoor heat converter 13 flows out flows into decompressors 16 behind second stream 52 by inner heat exchanger 50.The cold-producing medium that flows into decompressor 16 roughly becomes with the state when indoor heat converter 13 flows out.

(the 11 embodiment of invention) describes the 11 embodiment of the present invention.The air conditioner 10 of this embodiment is that the structure by refrigerant loop 11 in the air conditioner 10 that changes described first embodiment obtains.The air conditioner 10 and the different place of described first embodiment of this embodiment are described here.

As shown in figure 20, in the refrigerant loop 11 of this embodiment, be provided with heat exchange department 85.Heat exchange department 85 is set at pipeline that first port and outdoor heat converter 12 with the 2nd four-way change-over valve 22 couple together midway in this refrigerant loop 11.Heat exchange department 85 is incorporated in the inside of cold-producing medium adjusting tank 14, becomes the state in the liquid refrigerant that is immersed in the cold-producing medium adjusting tank 14.

-running action-when carrying out cooling operation, cold-producing medium in refrigerant loop 11 according to Figure 20 in the direction shown in the arrow of solid line circulate.At this moment, the cold-producing medium of the gas-liquid two-phase system state that flows out from decompressor 16 is separated into liquid refrigerant and gas refrigerant after flowing into cold-producing medium adjusting tank 14.Liquid refrigerant in the cold-producing medium adjusting tank 14 is sent to indoor heat converter 13.The cold-producing medium that flows out from outdoor heat converter 12 flows into heat exchange department 85, and cooled dose of adjusting tank 14 interior liquid refrigerants cool off.The cold-producing medium that has been cooled in heat exchange department 85 flows in the decompressor 16 afterwards.

On the other hand, when making warm running, cold-producing medium in refrigerant loop 11 according to Figure 20 in the direction shown in the arrow of dotted line circulate.At this moment, the cold-producing medium of the gas-liquid two-phase system state that flows out from decompressor 16 is separated into liquid refrigerant and gas refrigerant after flowing into cold-producing medium adjusting tank 14.Liquid refrigerant in the cold-producing medium adjusting tank 14 is by in the heat exchange department 85 back inflow outdoor heat exchangers 12.The cold-producing medium that flows out from indoor heat converter 13 flows into the decompressor 16.

In described each embodiment, controller 90 can constitute (other embodiment): the aperture of control hydraulic fluid side control valve 32, gas side control valve 34 makes the height of freeze cycle press to the desired value of regulation.

In this case, controller 90 is set the control desired value relevant with the high pressure of freeze cycle.Particularly, controller 90 is obtained the measured value of the refrigerant temperature of the measured value of low pressure of freeze cycle and gas cooler outlet from sensor etc.On the other hand, this controller 90, the high pressure that the COP of freeze cycle is become maximum freeze cycle stores in advance as the function of the refrigerant temperature at the low pressure of freeze cycle and gas cooler outlet place.At this moment, the state with the suction cold-producing medium of compressor 15 for example is set at " 5 ℃ of the degrees of superheat " or " saturation state " etc. in advance.The row operation of going forward side by side in the function that controller 90 has been stored obtained measured value substitution is set at the control desired value with the value that obtains therefrom.

As described first, controller 90 among the 5th, the 7th, the 9th and the 11 embodiment, the mechanism of the aperture of control hydraulic fluid side control valve 32, gas side control valve 34, the measured value of the high pressure of the control desired value set and freeze cycle is contrasted, according to this aperture of regulator solution side control valve 32, gas side control valve 34 as a result.

For example, suppose freeze cycle high pressure measured value than control desired value low.At this moment, if the state of gas side control valve 34 for opening, controller 90 just makes the aperture of gas side control valve 34 reduce.Even gas side control valve 34 is for cutting out fully, still than control desired value height, controller 90 just increases the aperture of hydraulic fluid side control valve 32 measured value of the ejection refrigerant temperature of compressor 15.On the contrary, the measured value ratio of supposing the ejection refrigerant temperature of compressor 15 is controlled desired value for high.At this moment, if the state of hydraulic fluid side control valve 32 for opening, 90 apertures with hydraulic fluid side control valve 32 of controller reduce.Even hydraulic fluid side control valve 32 is for cutting out fully, the measured value of the ejection refrigerant temperature of compressor 15 is low than the control desired value, and controller 90 just increases the aperture of gas side control valve 34.

As the controller 90 among described second to the 4th, the 6th, the 8th and the tenth embodiment, the mechanism of the aperture of control hydraulic fluid side control valve 32, the measured value of the high pressure of the control desired value set and freeze cycle is contrasted, according to this aperture of regulator solution side control valve 32 as a result.

For example, if the measured value of the high pressure of freeze cycle is littler than the control desired value, 90 of controllers increase the aperture of hydraulic fluid side control valve 32.On the contrary, if the measured value of the ejection refrigerant temperature of compressor 15 is bigger than the control desired value, 90 of controllers increase the aperture of gas side control valve 34.

Industrial applicibility

In sum, the present invention is for comprising the decompressor 16 that is connected with to reclaim power Refrigerant loop 11 refrigerating plant of great use.

Claims

1. refrigerating plant comprises the refrigerant loop (11) that is connected with in order to the decompressor (16) that reclaims power, allows cold-producing medium circulate in this refrigerant loop (11) and carries out freeze cycle, it is characterized in that:

Comprise:

Cold-producing medium adjusting tank (14) is set in this refrigerant loop (11) the cold-producing medium circulation path from decompressor (16) to compressor (15) midway for the amount that is adjusted in the cold-producing medium of circulation in the described refrigerant loop (11),

Liquid sprays path (31), in order to the liquid refrigerant in the described cold-producing medium adjusting tank (14) being supplied with the suction side of described compressor (15), and

Fluid flow governor motion (32) is in order to regulate the refrigerant flow in the described liquid injection path (31).

2. refrigerating plant according to claim 1 is characterized in that:

Cold-producing medium adjusting tank (14) is set at the cold-producing medium circulation path from decompressor (16) to compressor (15) than evaporimeter down downstream also.

3. refrigerating plant according to claim 1 is characterized in that:

Cold-producing medium adjusting tank (14) is set at the cold-producing medium circulation path from decompressor (16) to compressor (15) than evaporimeter up upstream side also.

4. refrigerating plant according to claim 3 is characterized in that:

Comprise: spray path (33) and in order to regulate the gas flow governor motion (34) that described gas sprays the refrigerant flow in the path (33) in order to the gas of the suction side that the gas refrigerant in the cold-producing medium adjusting tank (14) fed to compressor (15).

5. according to each the described refrigerating plant in the claim 1 to 4, it is characterized in that:

The high pressure of the freeze cycle that allows cold-producing medium circulate in refrigerant loop (11) and carry out is set to the value also higher than the critical pressure of this cold-producing medium.

6. according to each the described refrigerating plant in the claim 1 to 3, it is characterized in that:

The high pressure of the freeze cycle that allows cold-producing medium circulate in refrigerant loop (11) and carry out is set to the value also higher than the critical pressure of this cold-producing medium;

This refrigerating plant comprises controlling organization (90), and this controlling organization (90) is controlled fluid flow governor motion (32), and making becomes the control desired value of regulation from the temperature of the cold-producing medium of compressor (15) ejection.

7. refrigerating plant according to claim 4 is characterized in that:

This refrigerating plant comprises controlling organization (90), and this controlling organization (90) is controlled fluid flow governor motion (32) and gas flow control device (34), and making becomes the control desired value of regulation from the temperature of the cold-producing medium of compressor (15) ejection.

8. according to each the described refrigerating plant in the claim 1 to 3, it is characterized in that:

This refrigerating plant comprises controlling organization (90), and this controlling organization (90) is controlled fluid flow governor motion (32), makes the height of the freeze cycle of carrying out in described refrigerant loop (11) press to the control desired value of regulation.

9. refrigerating plant according to claim 4 is characterized in that:

This refrigerating plant comprises controlling organization (90), this controlling organization (90) is controlled fluid flow governor motion (32) and gas flow control device (34), makes the height of the freeze cycle of carrying out in described refrigerant loop (11) press to the control desired value of regulation.

10. refrigerating plant according to claim 6 is characterized in that:

Controlling organization (90) constitutes: set the control desired value according to the operating condition of freeze cycle, make the coefficient of performance of the freeze cycle of carrying out in refrigerant loop (11) become the maximum that can access under at that time the operating condition.

11., it is characterized in that according to claim 7 or 9 described refrigerating plants:

12. refrigerating plant according to claim 8 is characterized in that:

13. refrigerating plant according to claim 5 is characterized in that:

Be filled with carbon dioxide in the refrigerant loop (11) and make cold-producing medium.